Placenta previa is the implantation of the placenta where it at least partially covers the cervix. It occurs in about one in 250 pregnancies.
Types of Placenta Previa
There are four types of placenta previa:
- Complete previa is where the cervix is completely covered by the placenta.
- Partial previa is where a portion of the cervix is covered by the placenta.
- Marginal previa is where the placenta extends to the edge of the cervix, without covering it.
- Low-lying previa is where the placenta is implanted in the lower uterine area, but not touching the cervixdge of the cervix.
Suspecting Placenta Previa
Placenta previa is usually suspected if there are one or more of the following symptoms:
- Painless bleeding during the end of the second trimester or third trimester.
- Premature contractions.
- Breech or transverse position.
- Larger uterus measurements.
Resolving Placenta Previa
90-95% of placenta previa diagnoses are resolved when the baby reaches full term. The partial previa can self-correct as the uterus enlarges and the placental site moves. You will usually undergo follow-up ultrasounds to determine the placement of the placenta in relationship to your cervix.
Placenta Previa Complications
Complications for the baby include:
- Possible abornmal intrauterine growth.
- Increased occurances of abnormalities.
Complications for the mother include:
- Possible hemorrhaging.
- Cesarean delivery.
Increased risk of placenta accreta.
Who is at Risk for Placenta Previa?
- Women with previous c-sections.
- Women diagnosed with a previous placenta previa.
- Women pregnant with multiple babies.
- Women over the age of 30.
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